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25#ifndef _EXTENT_MAP_H
26#define _EXTENT_MAP_H
27
28struct ocfs2_extent_map_item {
29 unsigned int ei_cpos;
30 unsigned int ei_phys;
31 unsigned int ei_clusters;
32 unsigned int ei_flags;
33
34 struct list_head ei_list;
35};
36
37#define OCFS2_MAX_EXTENT_MAP_ITEMS 3
38struct ocfs2_extent_map {
39 unsigned int em_num_items;
40 struct list_head em_list;
41};
42
43void ocfs2_extent_map_init(struct inode *inode);
44void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
45void ocfs2_extent_map_insert_rec(struct inode *inode,
46 struct ocfs2_extent_rec *rec);
47
48int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
49 u32 *num_clusters, unsigned int *extent_flags);
50int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
51 u64 *ret_count, unsigned int *extent_flags);
52
53int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
54 u64 map_start, u64 map_len);
55
56int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster,
57 u32 *p_cluster, u32 *num_clusters,
58 struct ocfs2_extent_list *el,
59 unsigned int *extent_flags);
60
61int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr,
62 struct buffer_head *bhs[], int flags,
63 int (*validate)(struct super_block *sb,
64 struct buffer_head *bh));
65int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci,
66 struct ocfs2_extent_list *el,
67 struct buffer_head *eb_bh,
68 u32 v_cluster,
69 u32 *num_clusters);
70static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block,
71 struct buffer_head **bh,
72 int (*validate)(struct super_block *sb,
73 struct buffer_head *bh))
74{
75 int status = 0;
76
77 if (bh == NULL) {
78 printk("ocfs2: bh == NULL\n");
79 status = -EINVAL;
80 goto bail;
81 }
82
83 status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate);
84
85bail:
86 return status;
87}
88
89
90#endif
91